By mesne



(NoModel.) T. J. YOUNG.

UUNDUIT FON UNDERGROUND PIPBS.

Patented June 19, 1888.

N.V Firms. Phowulwgmphef, wamngm. p. c.

UNITED STATES PATENTA OEETCE.

THOMAS J. YOUNG, OF BOSTON, MASSACHUSETTS, ASSIGNOR, `BY MESNE ASSIGNMENTS, TO HIMSELF, C. L. PERRIN, AND MARK \VILMARTH, ALL

OF SAME PLAGE.

CONDUIT FOR UNDERGROUND PIPES.

SPECIFCATION forming part of Letters Petten?. No. 384,948, dated June 19, 1888.

Application filed February Q3, 1888. Serial No. 264,0'20. (No model.)

.To all whom, it may concern..-

Beit known that I, THOMAS J. YOUNG, of Boston, in the county ot' Suii'olk and State of Y Massachusetts, have invented certain new and useful Improvements in Conduits for Underground Pipes, of which the following is a specification.

This invention has for its object to provide an improved conduit for pipes laid underto ground for the purpose of conveying hot water or steam.

The invention consists in acasing composed of a bed or base ot' a suitable plastic material which hardens quickly-such as cement or orif; diuary paving concrete-laid at the bottom of a trench, and twoV series of arched covers or casing-sections supported by said bed and placed end to end to form a continuous inner and outer casing separated by an airspace,

the inner casing being of suitable size to receive the pipe or pipes which the casings are designed to protect. The brackets which support the pipes are embedded in the bed and iirml y supported thereby against longitudinal strain exerted on them by the pipes.

Ofthe accompanying drawings,forming part of this specification, Figure l represents a perspective view of one of the sections of the outer casing. Fig. 2 represents a perspective `3o View of one ofthe sections of the inner casing.

Fig. 3 represents a transverse section of the entire casing and the pipes therein. Fig. 4 represents a longitudinal. section `on line m x, Fig. 3. Fig. 5 represents a sectional view of a modification.

The same letters of reference indicate the same parts in all the figures.

In carrying out my invention I form in the bottom of a trench dug in the grounda hed or 43 base, a, of any suitable cement or concrete, or other plastic material which becomes hard after being laid. The supporting brackets or frames b for the pipes, c c, to be protected are embedded insaid bed or base, as shown in 45 Figs. 3 and 4, and are thus firmly supported so that they will resist longitudinal pressure caused by the expansion and contraction of the pipes, the latter resting ou rollers 1' r in said brackets or frames. A groove or drain,

purpose of carrying off Water that may,ac' cumulate upon the bed a from any source. The'pipes being in place over the bed a, I place over said pipesa series of sections, d, of inverted-U shape, the edges of said sections being embedded in the bed or base awhile the latter is in a plastic condition. The sections d are placed end to end to form a continuous easing, and thejoints of their ends are preferably eovered by joint-protectors g, of suitable 6o form, or made with regular socket ends, asili the ease of sewer-pipes. Over the sections d I then place a series of casing-sections, e, formed like the sections d, but of larger size, so that when the lower edges of the sections e are embeddedin the bed or base c an air-space, s, will exist between the inner and o uter casings. The" joints of the outer casing thus formed are also covered by joint-protectors g.

The casing-sections may be made of any 7o suitable material which can be molded into the form shown and subsequently made suit-- ably hard and strong by tiring,or by the chemical change known as setting in case the sections are composed wholly or in part ofcem-` ent. Fire-clay, terra-cotta, terracotta wood, a mixture of cement, sand, and Water, and the material of which agricultural drain-pipe is made may be specified as suitable materials for the casing-sections of my invention, al` 8o though I do not limit myself to these materials. After the outer' easingsections are in place the trench may be filled in,`the outer easing su pporting the weight of the superincu mbent earth. It will be seen that the casing composed of the cement bed and the arched sections laid upon saidbed and held in placelaterally thereby may be very rapidly constructed, and consti-` tutes au efficient and economical substitute for'gD arches of brick.

I do not limit :myself to the embedding of the casingsecton edges iu the bed while the latter is in a plastic condition, as the result will be the same if the sections are laid on the bed after the latter has hardened and then secured by additional cement laid upon the bed and becoming a part thereof.

t, is formed in the bed under the pipes for the 5o I prefer to form ribs or flangesz'z'on the edges of the outer casingsections, so that when said edges are embedded in the bed or base a they will be firmly interlocked with the latter.

The casing sections may be connected at their lower edges by webs u u of the same material, as shown in Fig. 5, the inner and outer sections being made in practically one piece.

The casing-sections are provided at suitable intervals with side openings to receive houseconnections from the main supply-pipe. Said openings are elongated,as shown,to permit the movement of the house-connections caused by the expansion and contraction of the main pipe- My invention is not limited to arched casings made in molded sections, as here shown, as the concrete bottom having the pipe-brackets embedded in it may be used with brick casings.` I greatly prefer the molded sections, however, on account of the cheapness rand facility with which they may be laid.

I claim- 1. The combination, with a trench and a pipe or pipes therein, of a hed of concrete or like material and supports for said pipes embedded in said concrete, and arched casings supported by said bed and covering thc pipe or pipes.

2. The combination, with a trench and a pipe or pipes therein, ot` a supporting hed of concrete or like material having a water conducting drain or groove formed in it under said pipes, pipe supporting brackets embedded in said concrete, and arched casings supported by said bed and covering the pipe or pipes.

3. The combination of a trench, a heatconducting pipe or pipes therein,inner casing sections covering said pipes, outer casing-sections covering the inner sections and separated therefrom by an air-space, whereby loss of heat is reduced, said sections being placed end to end, and protectors g g for the joints ofsaid sections, as set forth.

4. The improved casing or conduit for underground pipes hereinbefore described, the same consisting of a bed or base formed inthe bottom of a trencl1,'and two series of arched casingsections supported by said bed, one within the other, and separated by an airspace, the inner section containing the pipe or pipes to be protected and the outer section supporting the filling of the trench, as set forth.

5. The improved casing or conduit for underground pipes hereinbepfore described, the same consisting ot' a hed or base of originally plastic material formed in the bottom of a trench, and two series of arched casing-sections having their edges embedded in the material of said bed, said sections being separated by an air space, as set forth. -Y 1.

6. The improved casing or conduit for underground pipes hereinbefore described, composed of the concrete bed, the smaller inner casingsections having their edges embedded in said bed, and the larger outer sections llaving flanged edges also embedded in said bed, as set forth.

In testimony whereofI have signed my name to this specilieatiomin the presence of two subscribing witnesses, this 20th day of February, 1888.

THOMAS J. YOUNG.

Witnesses:

GHARLns L. PERRiN, C. F. BROWN. 

